Revert "drm/panel: Add device_link from panel device to DRM device"

This reverts commit 0c08754b59da5557532d946599854e6df28edc22.

commit 0c08754b59da
("drm/panel: Add device_link from panel device to DRM device")
creates a circular dependency under these circumstances:

1. The panel depends on dsi-host because it is MIPI-DSI child
   device.
2. dsi-host depends on the drm parent device (connector->dev->dev)
   this should be allowed.
3. drm parent dev (connector->dev->dev) depends on the panel
   after this patch.

This makes the dependency circular and while it appears it
does not affect any in-tree drivers (they do not seem to have
dsi hosts depending on the same parent device) this does not
seem right.

As noted in a response from Andrzej Hajda, the intent is
likely to make the panel dependent on the DRM device
(connector->dev) not its parent. But we have no way of
doing that since the DRM device doesn't contain any
struct device on its own (arguably it should).

Revert this until a proper approach is figured out.

Cc: Jyri Sarha <jsarha@ti.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180927124130.9102-1-linus.walleij@linaro.org

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index b902361..1d9a9d2 100644 (file)
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -24,7 +24,6 @@
 #include <linux/err.h>
 #include <linux/module.h>
 
-#include <drm/drm_device.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_panel.h>
 
@@ -105,13 +104,6 @@ int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector)
        if (panel->connector)
                return -EBUSY;
 
-       panel->link = device_link_add(connector->dev->dev, panel->dev, 0);
-       if (!panel->link) {
-               dev_err(panel->dev, "failed to link panel to %s\n",
-                       dev_name(connector->dev->dev));
-               return -EINVAL;
-       }
-
        panel->connector = connector;
        panel->drm = connector->dev;
 
@@ -133,8 +125,6 @@ EXPORT_SYMBOL(drm_panel_attach);
  */
 int drm_panel_detach(struct drm_panel *panel)
 {
-       device_link_del(panel->link);
-
        panel->connector = NULL;
        panel->drm = NULL;
 

diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 582a0ec..7778147 100644 (file)
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -89,7 +89,6 @@ struct drm_panel {
        struct drm_device *drm;
        struct drm_connector *connector;
        struct device *dev;
-       struct device_link *link;
 
        const struct drm_panel_funcs *funcs;